I've been a customer of http://www.bhphotovideo.com
for more than fifteen years, mostly for accessories that don't sell enough for the local guys to keep them in stock, and I've always found them to be a reliable source. They have good prices, prompt shipment, and a broad inventory.
That said, I've bought all my high-dollar stuff, film cameras in 35mm SLR and medium format, DSLRs (Nikon D70, D200, D700), Epson printers (2000P, 2200, R2880), and film scanners (8000ED, 9000ED), plus all my consumables (photo paper, ink) from the local camera shop. Those items aren't discounted much online, and it's about a wash between shipping from an online vendor and paying state sales tax.
The camera shop is just a few blocks from my house and is independent and locally owned, and staffed by friendly, knowledgeable, helpful people. It's a plus to be able to walk into a store, find almost anything I need, and take it home, and I'm willing to pay an occasional premium because the local guys have gone the second mile to treat me right on out-of-warranty repairs a couple of times. For anyone within a reasonable drive of Fort Wayne, Indiana, I recommend Sunny Schick Camera Shop on West Washington Boulevard downtown. They've been in the same location for more than 80 years.
I have no personal or commercial interest in the business.